CN101773168A - Quantitative selenium-enriched tea generating method - Google Patents

Abstract

The invention discloses a quantitative selenium-enriched tea generating method. The method comprises the steps of: spraying solution of sodium selenite at a concentration of 300 to 500 mg/kg on leaf surfaces of growing tea trees in the selenium-lacking or selenium-insufficient fields of which the selenium content is lower than 0.2 mg/kg 6 days before the tea leaves of the required specifications are picked, wherein the sprayed amount is calculated by regression equations below: Y spring= 13,693.5X+120, Y summer=10,176X+372, and Y autumn=7,298X+304,wherein, Y is designed selenium content (mu g/kg) of the tea leaves, Y spring represents spring tea, Y summer represents summer tea, Y autumn represents autumn tea and X is sprayed selenium dosage ( the sodium selenite: kg/ha); and picking up the fresh leaves in 6 and 12 days after the selenium is sprayed to prepare the tea. The method of the invention is simple and feasible and the selenium content of the finished tea products can be controlled precisely, so the selenium-enriched tea has stable quality and can be regularly produced.

Description

Quantitative selenium-enriched tea generating method

Technical field

The invention belongs to general botany, what relate to is a kind of production method that contains selenium element tealeaves, the production method that contains selenium tealeaves that particularly a kind of selenium content can be controlled.

Background technology

Selenium has been confirmed to be one of trace element of needed by human, and scarce selenium can cause nearly kind of disease surplus in the of 40 such as Kaschin-Beck disease, Keshan disease, and vast scarce selenium area crowd is mended selenium, is the effective measures of these diseases of control.From the different shape selenium source human body is mended selenium and be used for, organic selenium source is better than inorganic selenium source, and the vegetalitas selenium source in organic selenium source is better than animality selenium source again.In the vegetalitas selenium source, rich selenium tea is one of desirable benefit selenium source.

At present, containing selenium tealeaves has natural selenium-rich tea and artificial rich selenium tea, and natural selenium-rich tea forms than higher naturally because of selenium content in the soil; Artificial rich selenium tea is artificially to the tea tree foliage spray inorganic selenium aqueous solution, and the organic selenium that is absorbed into by tealeaves gets.Se content in the natural selenium-rich tea is not subjected to artificial control, and the difference of soil selenium-containing amount causes tealeaves selenium content difference very big, and difference of height reaches 17 times more than; The production of artificial rich selenium tea is to the tea tree foliage spray inorganic selenium aqueous solution that lacks selenium, leaf bud is absorbed and accumulation selenium element, and makes inorganic selenium be converted into organic selenium, thereby reach the purpose that tealeaves is rich in organic selenium.For example: people such as Hu Qiuhui are at " Agricultural University Of Nanjing's journal " 1999, (03), " low selenium soil tea place tealeaves selenium-rich method and the rich selenium effect thereof " delivered on the 91-94, on low selenium or poor selenium soil, select for use sodium selenite to do external selenium source, is the sodium selenite aqueous solution of 100mg/L to the tea tree blade face of growing with concentration, by 50～100g/hm ²Spray, pluck bright leaf in 8～26 days, make tealeaves, the tealeaves selenium content reaches 0.32～1.45mg/Kg; Again for example: it is to adopt foliage-spray to contain the selenium aqueous solution that Chinese patent publication number CN1058879 discloses a kind of " artificial cultivation method of rich selenium tea " feature, the concentration of selenium element is 70-500ppm, can improve and stable tealeaves in selenium content (400-4000ppb).Yet, with regard to the rich selenium tea of present artificial production method, the prior art effect of tealeaves selenium content that is improved, but the selenium content of tea products is quantitatively controlled.

Human body needs the selenium element, has lacked badly, how also not all right, shows that human body has quantitative limitation to the demand of this element.Therefore, produce the rich selenium tea that a kind of selenium content can access certain control, not only people are very helpful according to measuring the benefit selenium of drinking tea, and can make rich selenium tea be able to standard production.

Summary of the invention

The objective of the invention is to propose a kind of production method of quantitative selenium-enriched tea, reach the selenium constituent content requirement of expectation to guarantee the rich selenium tea of commodity.

The technical scheme that realizes above-mentioned purpose is: Se content is lower than scarce selenium below the 0.2mg/Kg or the tea tree on the poor selenium soil, grew preceding 6 days desiring to adopt specification tealeaves, is that the sodium selenite solution of 300～500mg/kg carries out foliage-spray to the tea tree blade face of growing with concentration, and the amount of spraying is measured according to following regression equation:

Y _Spring=13693.5X+120

Y _Summer=10176X+372

Y _Autumn=7298X+304

In the formula: Y is the Se content (μ g/Kg) in the design tealeaves, generally is divided into three class, and keeping out is 1000～2000 μ g/kg; Middle-grade is 2000-3000 μ g/Kg; Top grade is 3000～4000 μ g/Kg.

Y _SpringBe spring tea; Y _SummerBe summer tea; Y _AutumnBe autumn tea.

X is for executing selenium dosage (sodium selenite: Kg/ha).

Execute and pluck bright leaf behind the selenium in 6～12 days, make tealeaves.

The preferred concentration of above-mentioned sodium selenite solution is 400mg/kg.

The inventive method is simple, and the selenium content of finished tea can access comparatively accurately control, people's amount of complying with is drunk tea mend selenium to be achieved, and can make rich selenium tea steady quality and can standard production.

The specific embodiment

Below in conjunction with embodiment the present invention is described in further detail.

Embodiment 1

Se content is lower than scarce selenium below the 0.2mg/Kg or the tea tree on the poor selenium soil, grew preceding 6 days desiring to adopt the specification spring tea, foliage-spray is carried out with sodium selenite solution in the tea tree blade face of growing, the amount of spraying is according to regression equation Y _Spring=13693.5X+120 calculates.

At first set: Y _Spring=1000～2000 μ g/Kg

Calculate sodium selenite application dosage: X=64.3～137.3g/ha, take the mean: 100g/ha,

Get the 100g sodium selenite, be made into the aqueous solution that concentration is 400mg/kg, evenly spray on the blade face, tea place of an are (ha).Execute the bright leaf of the tea of adopting a bud two, three leaves behind the selenium in 6～12 days, the branch contracture is put, and makes rich selenium fried green tea by roasted green tea processing technology rules, and the testing result Se content is 1567 μ g/kg.

If execute behind the selenium and meet rainfall in 24 hours, then fill spray behind the rain, the collecting period postpones.

Embodiment 2

Grew preceding 6 days desiring to adopt the specification summer tea, foliage-spray is carried out with sodium selenite solution in the tea tree blade face of growing, the amount of spraying is according to regression equation Y _Summer=10176X+372 calculates.

At first set: Y _Summer=2000～3000 μ g/Kg

Calculate: X=160.0g/ha～258.3g/ha, take the mean: 210g/ha.

Get the 210g sodium selenite, be made into the aqueous solution that concentration is 400mg/kg, evenly spray on the blade face, tea place of an are (ha).Then according to the method for embodiment 1 pick tea-leaves, tea making, make the rich selenium fried green of controlled quentity controlled variable tea, detecting Se content is 2728 μ g/kg.

Embodiment 3

Grew preceding 6 days desiring to adopt the specification autumn tea, foliage-spray is carried out with sodium selenite solution in the tea tree blade face of growing, the amount of spraying is according to regression equation Y _Autumn=7298X+304 metering,

At first set: Y _Autumn=3000～4000 μ g/Kg

Calculate: X=369.4g/ha～506.4g/ha, 440g/ha takes the mean.

Get the 440g sodium selenite, be made into the aqueous solution that concentration is 400mg/kg, evenly spray on the blade face, tea place of an are (ha).Then according to the method for embodiment 1 pick tea-leaves, tea making, obtain the rich selenium fried green of controlled quentity controlled variable tea, detecting Se content is 3728 μ g/kg.

Be the demonstration test result that the applicant does according to the inventive method in the tea processing factory in the poor selenium of Mi Cang mountain, west section north slope area, the domestic Bashan Mountain of Shaanxi Province's Hanzhong City below:

(Se content unit: mg/Kg)

Test year	Design contains the selenium level	Design Se content territory	The checking tea plantation	Selenium content as a result
					The 3rd test year	High in low	????1.0-2.0????2.0-3.0????3.0-4.0	Mi Cang camellia field, 2 Hanzhong, Mi Cang camellia field, 1 Hanzhong, Mi Cang camellia field, Hanzhong 3	????1.422????2.923????3.439
The 4th test year	High in low	????1.0-2.0????2.0-3.0????3.0-4.0	Mi Cang camellia field, 4 Hanzhong, Mi Cang camellia field, 1 Hanzhong, Mi Cang camellia field, Hanzhong 5	????1.567????2.728????3.728
					Another test year	Extra-high-speed	????12.0-15.0	Mi Cang camellia field, Hanzhong 6	????12.20

Claims (2)

1. quantitative selenium-enriched tea generating method, it is characterized in that: Se content is lower than scarce selenium below the 0.2mg/Kg or the tea tree on the poor selenium soil, grew preceding 6 days desiring to adopt specification tealeaves, is that the sodium selenite solution of 300～500mg/kg carries out foliage-spray to the tea tree blade face of growing with concentration, and the amount of spraying is measured according to following regression equation:

Y _Spring=13693.5X+120

Y _Summer=10176X+372

Y _Autumn=7298X+304

In the formula: Y is the Se content (μ g/Kg) in the design tealeaves, generally is divided into three class, and keeping out is 1000～2000 μ g/Kg; Middle-grade is 2000-3000 μ g/Kg; Top grade is 3000～4000 μ g/Kg;

Y _SpringBe spring tea; Y _SummerBe summer tea; Y _AutumnBe autumn tea;

X is for executing selenium dosage (sodium selenite: Kg/ha);

Execute and pluck bright leaf behind the selenium in 6～12 days, make tealeaves.

2. according to the described quantitative selenium-enriched tea generating method of claim 1, it is characterized in that: the concentration of sodium selenite solution is 400mg/kg.